1845, William Simcox BRICKNELL, The Judgment of the Bishops Upon Tractarian Theology. A Complete Analytical Arrangement of the Charges Delivered by the Prelates of the Anglican Church, from 1837 to 1842 Inclusive; So Far as They Relate to the Tractarian Movement. With Notes and Appendices, page 625:

And it is, as I said, with unmingled satisfaction, that I find that no disposition has been evinced among us, to commit any of these irregular reappropriations; or to adopt any of these devices, novel or obsolete, for the decoration or dedecoration of sacred edifices, and those who minister in them.

1856, William Conyngham PLUNKET (1st Baron Plunket.), John Cashel HOEY, Speeches at the Bar and in the Senate ... Edited, with a memoir and historical notices, by J. C. Hoey, page 261

He was advised that it clearly might; that these mummers had no right to lay their hands on this public ornament, whether for the purpose of decoration or dedecoration

Dedecoration did not produce any advantages in observing the size of the displacement of dislocations.

Applying the star-triangle and dedecoration transformations […]

Part or all of this entry has been imported from the 1913 edition of Webster’s Dictionary, which is now free of copyright and hence in the public domain. The imported definitions may be significantly out of date, and any more recent senses may be completely missing.
(See the entry for dedecoration inWebster’s Revised Unabridged Dictionary, G. & C. Merriam, 1913.)